@article{wang2021ufo,
  title={UFO: A UniFied TransfOrmer for Vision-Language Representation Learning},
  author={Wang, Jianfeng and Hu, Xiaowei and Gan, Zhe and Yang, Zhengyuan and Dai, Xiyang and Liu, Zicheng and Lu, Yumao and Wang, Lijuan},
  journal={arXiv preprint arXiv:2111.10023},
  year={2021}
}